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Nordgreen, Tine; Havik, Odd E.2011.Use of Self-Help Materials for Anxiety and Depression in Mental Health Services: A National Survey of Psychologists in Norway.Professional psychology, research and practice.42: 185-191. doi: 10.1037/a0022729

Nordgreen, T. & Havik, O. E. (2011). Use of Self-Help Materials for Anxiety and Depression in Mental Health Services: A National Survey of Psychologists in Norway. Professional Psychology: Research and Practice, 42, 185-191.